moon_unit2 writes: We're all familiar with ads that seem to follow you around as you go from one website to another. A startup called Drawbridge has developed technology that could let those ads follow you even when you pic up a smartphone or tablet. The company, founded by an ex-Google scientist employs statistical methods to try and match identify users on different devices. The idea is that this will preserve privacy while making mobile ads more lucrative, although some experts aren't convinced that the data will be truly anonymous.